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Title: Abrasive Blast Cleaning Nozzle
Author: Gary S. Settles
Source: US Patent 5,975,996
Publication year 1999
Document number: 1999071
Number of pages: 11
Abstract:
A nozzle for an abrasive blast cleaning apparatus consisting of a short, relatively rapidly converging inlet section, a constant-area throat, a rapidly diverging first
diverging section, and a long second diverging section that diverges less rapidly than the first diverging section. The inlet section quickly accelerates the abrasive
particles after entering the nozzle, while the first diverging section rapidly brings the relative velocity of the air stream and the abrasive particles to about Mach 1.4.
The second diverging section helps to maintain the relative Mach number while the abrasive particles continue to accelerate. This makes abrasive blast cleaning more
efficient, particularly because the kinetic energy of the abrasive particles emerging from the nozzle is significantly increased.
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